RegExpresso is a "regular expressions" tester, designed to integrate well into modern web browsers. Though it has few features compared to commercial products, it should be usefull to any programmer who uses regular expressions.

CodeInvestigator is a tracing tool for Python programs. All the run time information is recorded. Read your code together with its run time details. Use it to visualize what happened when you program ran.

Project that allows you to edit various files on a server through your web browser. Has syntax highlighting, and eventually will beable to debug php files through it's interface You can see a sample here: http://www.phpwebbug.org/TestClient/

The Open Log Engine is a powerful tool for advanced logging in games or programs. It easily allows you to make logging outputs in your program and analyse them afterwards with the Open Log Viewer, which provides you a powerful filtering system.

The project is designed to make life easier for programmers using javascript. Updated trace panel(disegner will work on it later :) ). And one issue with IE6. Compatible with IE7+, Chrome, FF2+, Opera(?)

Jdptool is a debug and profiler tool which based on JPDA; It provide both swing based and browser based GUI. It has sophisticated debugger without user interfere. It also provide profiler to memory usage and threads with numerous new feature

JS# is a C# - like programming language that works in client side and uses JavaScript in background to provide a perfect and clean OOP ability to your client side program. You can compile your JS# code to pure JavaScript code or just let it be JS#.

The log4script is framework enabling client side code running in a context of browser (either IE of Firefox) to use common logging as done on server side - meaning the logging can be analyzed, persisted, etc...